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Flows and Recreational Floating on the Niobrara National Scenic River, Nebraska

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Flows and Recreational Floating on the Niobrara National Scenic River, Nebraska Photo credit: National Park Service Prepared for… Nebraska Game and Parks Commission 2200 No. 33rd St. ● Lincoln, Nebraska 68503 In cooperation with… National Park Service P.O. Box 591 ● O'Neill, Nebraska 68763 Nebraska Environmental Trust 700 S 16th Street ● Lincoln, Nebraska 68509 Prepared by… Doug Whittaker Ph.D. & Bo Shelby, Ph.D. Confluence Research and Consulting 3600 NW Thrush • Corvallis, Oregon 97331 6324 Red Tree Circle • Anchorage, Alaska 99507 April 2008 Table of Contents Executive Summary ........................................................................................................... iv Introduction ......................................................................................................................... 1 Methods............................................................................................................................... 2 Geographic Scope ........................................................................................................... 2 Review of Existing Information...................................................................................... 4 Recreation-Relevant Hydrology ..................................................................................... 4 Interviews with Experienced Resource Users................................................................. 4 Fieldwork ........................................................................................................................ 5 Integration and Analysis ................................................................................................. 5 Findings and Discussion ..................................................................................................... 6 Boating and Tubing Recreation ...................................................................................... 6 Recreation Values ....................................................................................................... 6 Floater and Float Trip Characteristics......................................................................... 6 Use Levels and Patterns .............................................................................................. 7 Segments ..................................................................................................................... 8 Trip Types ................................................................................................................... 8 Flow-Dependent Attributes ............................................................................................. 9 Attribute Importance ................................................................................................. 10 Flow Effects on Trip Attributes ................................................................................ 11 Summary of Recreation-Relevant Hydrology .............................................................. 14 Daily Flows Over the Period of Record .................................................................... 14 Daily Flows in an Example “Wet” Year ................................................................... 15 Daily Flows in an Example “Dry” Year ................................................................... 16 Flow Requirements for Boating Opportunities ............................................................. 17 Gage Calibration ....................................................................................................... 17 “Specified Flows” from Interviews .......................................................................... 17 Fieldwork Assessments ............................................................................................. 18 Integrated Flow Evaluation Curve and Range Bar ................................................... 19 Comparing Pre-Merritt, Post-Merritt and Potential Flow Regimes .............................. 20 Comparisons for the Period of Record...................................................................... 20 Example “Wet” Year ................................................................................................ 22 Example “Dry” Year ................................................................................................. 22 References ......................................................................................................................... 23 Appendix: Interview Questions ........................................................................................ 25 Flows and Recreational Floating on the Niobrara National Scenic River ● April 2008 ii List of Figures and Tables Figure 1. Regional context of the Niobrara watershed in Wyoming, Nebraska, and South Dakota. ............3 Figure 2. The study reviewed information for the Niobrara from Nenzel to Highway 137. .........................3 Figure 3. The study focused on the Niobrara River from Cornell Dam to Norden Bridge, the reach with the highest recreation use.....................................................................................................................3 Figure 4. Interviewee assessments of the importance of potential flow-dependent trip attributes on the Niobrara River. ............................................................................................................................ 10 Figure 5. Interviewees’ assessments of the size of flow effects on trip attributes on Niobrara NSR. ......... 11 Figure 6. Median daily flows from May through October for the period of record (1946 to 2007) at USGS Sparks Gage (06461500). ............................................................................................................ 14 Figure 7. Median Daily flows May through October at USGS Sparks Gage (06461500) in an example “wet” year (with comparisons to the period of record). ......................................................................... 15 Figure 8. Median Daily flows May through October at USGS Sparks Gage (06461500)in an example “dry” year (with comparisons to the period of record). ......................................................................... 16 Figure 9. Flow evaluation curve and range bar for scenic boating opportunities. ....................................... 19 Figure 10. Percent of days in different flow ranges for recreation seasons for pre- and post-Merritt Reservoir periods and under conceptual withdrawal scenarios for Niobrara River. .................................... 20 Figure 11. Percent of days in different flow ranges under post-Merritt and withdrawal scenarios in an example "wet" year (2000) on the Niobrara NSR. ....................................................................... 22 Figure 12. Percent of days in different flow ranges under post-Merritt and withdrawal scenarios in an example dry year (2002) on the Niobrara NSR. .......................................................................... 22 Table 1. Median flows and interquartile rnages for recreation opportunities for Niobrara NSR. ................ 17 Flows and Recreational Floating on the Niobrara National Scenic River ● April 2008 iii Executive Summary For approximately 100 miles through Nebraska’s Sand Hills, the Niobrara River is “a mountain stream in a prairie state,” offering outstanding scenery, plant communities, wildlife, and recreation opportunities. Congress recognized these values by designating a 76-mile reach east of Valentine as the Niobrara National Scenic River (NSR) in 1991. The Nebraska Game and Parks Commission (NGPC) and the National Park Service (NPS) are concerned about impacts from water development on the river’s natural resource values, including recreational floating. This report reviews river recreation on the Niobrara NSR and assesses how flows may affect recreational floating values. Methods Following established protocols, the study included several flow-recreation study methods, including: (1) a review of existing information (including a National Park Service user survey; (2) a summary of recreation-relevant hydrology; (3) boating-based reconnaissance of several river segments at low to moderate flows; and (4) interviews with outfitters and other experienced river users with knowledge of flows and recreation. Information was integrated to estimate the availability and quality of recreation opportunities under existing and alternative flow regimes. The study included river segments from Nenzel to Highway 137, but focused on the western half of the Niobrara NSR, which has higher recreation use. Hydrology information was developed to describe the range of flows available during recreation seasons. Throughout the report, flows are referenced to the United States Geological Survey (USGS) gage near Sparks (USGS Number 06461500), which is ideally located near the middle of the 30.4-mile high use reach. Fieldwork on the river was conducted in May 2006 and July 2007, allowing observations at about 440 and 800 cfs (at the USGS Sparks gage). An outfitter focus group was conducted in July 2007 and phone interviews were conducted in fall 2007. The interview panel included 27 outfitters, agency staff, and experienced users who had taken many trips on the river at different flows. Findings The Niobrara River from Cornell Dam to Norden Bridge provides “outstandingly remarkable” opportunities for regional floaters. Information from a National Park Service user survey shows that most Niobrara floaters are from Nebraska, part
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